334 lines
9.7 KiB
LLVM
334 lines
9.7 KiB
LLVM
; RUN: opt -S < %s -instcombine | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.7.0"
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; Check transforms involving atomic operations
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define i32 @test1(i32* %p) {
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; CHECK-LABEL: define i32 @test1(
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; CHECK: %x = load atomic i32, i32* %p seq_cst, align 4
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; CHECK: shl i32 %x, 1
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%x = load atomic i32, i32* %p seq_cst, align 4
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%y = load i32, i32* %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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define i32 @test2(i32* %p) {
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; CHECK-LABEL: define i32 @test2(
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; CHECK: %x = load volatile i32, i32* %p, align 4
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; CHECK: %y = load volatile i32, i32* %p, align 4
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%x = load volatile i32, i32* %p, align 4
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%y = load volatile i32, i32* %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; The exact semantics of mixing volatile and non-volatile on the same
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; memory location are a bit unclear, but conservatively, we know we don't
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; want to remove the volatile.
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define i32 @test3(i32* %p) {
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; CHECK-LABEL: define i32 @test3(
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; CHECK: %x = load volatile i32, i32* %p, align 4
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%x = load volatile i32, i32* %p, align 4
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%y = load i32, i32* %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; Forwarding from a stronger ordered atomic is fine
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define i32 @test4(i32* %p) {
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; CHECK-LABEL: define i32 @test4(
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; CHECK: %x = load atomic i32, i32* %p seq_cst, align 4
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; CHECK: shl i32 %x, 1
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%x = load atomic i32, i32* %p seq_cst, align 4
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%y = load atomic i32, i32* %p unordered, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; Forwarding from a non-atomic is not. (The earlier load
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; could in priciple be promoted to atomic and then forwarded,
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; but we can't just drop the atomic from the load.)
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define i32 @test5(i32* %p) {
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; CHECK-LABEL: define i32 @test5(
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; CHECK: %x = load atomic i32, i32* %p unordered, align 4
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%x = load atomic i32, i32* %p unordered, align 4
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%y = load i32, i32* %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; Forwarding atomic to atomic is fine
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define i32 @test6(i32* %p) {
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; CHECK-LABEL: define i32 @test6(
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; CHECK: %x = load atomic i32, i32* %p unordered, align 4
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; CHECK: shl i32 %x, 1
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%x = load atomic i32, i32* %p unordered, align 4
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%y = load atomic i32, i32* %p unordered, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; FIXME: we currently don't do anything for monotonic
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define i32 @test7(i32* %p) {
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; CHECK-LABEL: define i32 @test7(
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; CHECK: %x = load atomic i32, i32* %p seq_cst, align 4
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; CHECK: %y = load atomic i32, i32* %p monotonic, align 4
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%x = load atomic i32, i32* %p seq_cst, align 4
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%y = load atomic i32, i32* %p monotonic, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; FIXME: We could forward in racy code
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define i32 @test8(i32* %p) {
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; CHECK-LABEL: define i32 @test8(
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; CHECK: %x = load atomic i32, i32* %p seq_cst, align 4
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; CHECK: %y = load atomic i32, i32* %p acquire, align 4
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%x = load atomic i32, i32* %p seq_cst, align 4
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%y = load atomic i32, i32* %p acquire, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; An unordered access to null is still unreachable. There's no
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; ordering imposed.
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define i32 @test9() {
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; CHECK-LABEL: define i32 @test9(
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; CHECK: store i32 undef, i32* null
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%x = load atomic i32, i32* null unordered, align 4
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ret i32 %x
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}
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define i32 @test9_no_null_opt() #0 {
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; CHECK-LABEL: define i32 @test9_no_null_opt(
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; CHECK: load atomic i32, i32* null unordered
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%x = load atomic i32, i32* null unordered, align 4
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ret i32 %x
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}
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; FIXME: Could also fold
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define i32 @test10() {
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; CHECK-LABEL: define i32 @test10(
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; CHECK: load atomic i32, i32* null monotonic
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%x = load atomic i32, i32* null monotonic, align 4
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ret i32 %x
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}
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define i32 @test10_no_null_opt() #0 {
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; CHECK-LABEL: define i32 @test10_no_null_opt(
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; CHECK: load atomic i32, i32* null monotonic
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%x = load atomic i32, i32* null monotonic, align 4
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ret i32 %x
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}
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; Would this be legal to fold? Probably?
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define i32 @test11() {
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; CHECK-LABEL: define i32 @test11(
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; CHECK: load atomic i32, i32* null seq_cst
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%x = load atomic i32, i32* null seq_cst, align 4
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ret i32 %x
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}
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define i32 @test11_no_null_opt() #0 {
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; CHECK-LABEL: define i32 @test11_no_null_opt(
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; CHECK: load atomic i32, i32* null seq_cst
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%x = load atomic i32, i32* null seq_cst, align 4
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ret i32 %x
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}
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; An unordered access to null is still unreachable. There's no
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; ordering imposed.
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define i32 @test12() {
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; CHECK-LABEL: define i32 @test12(
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; CHECK: store atomic i32 undef, i32* null
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store atomic i32 0, i32* null unordered, align 4
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ret i32 0
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}
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define i32 @test12_no_null_opt() #0 {
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; CHECK-LABEL: define i32 @test12_no_null_opt(
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; CHECK: store atomic i32 0, i32* null unordered
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store atomic i32 0, i32* null unordered, align 4
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ret i32 0
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}
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; FIXME: Could also fold
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define i32 @test13() {
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; CHECK-LABEL: define i32 @test13(
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; CHECK: store atomic i32 0, i32* null monotonic
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store atomic i32 0, i32* null monotonic, align 4
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ret i32 0
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}
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define i32 @test13_no_null_opt() #0 {
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; CHECK-LABEL: define i32 @test13_no_null_opt(
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; CHECK: store atomic i32 0, i32* null monotonic
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store atomic i32 0, i32* null monotonic, align 4
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ret i32 0
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}
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; Would this be legal to fold? Probably?
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define i32 @test14() {
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; CHECK-LABEL: define i32 @test14(
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; CHECK: store atomic i32 0, i32* null seq_cst
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store atomic i32 0, i32* null seq_cst, align 4
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ret i32 0
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}
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define i32 @test14_no_null_opt() #0 {
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; CHECK-LABEL: define i32 @test14_no_null_opt(
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; CHECK: store atomic i32 0, i32* null seq_cst
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store atomic i32 0, i32* null seq_cst, align 4
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ret i32 0
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}
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@a = external global i32
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@b = external global i32
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define i32 @test15(i1 %cnd) {
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; CHECK-LABEL: define i32 @test15(
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; CHECK: load atomic i32, i32* @a unordered, align 4
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; CHECK: load atomic i32, i32* @b unordered, align 4
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%addr = select i1 %cnd, i32* @a, i32* @b
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%x = load atomic i32, i32* %addr unordered, align 4
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ret i32 %x
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}
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; FIXME: This would be legal to transform
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define i32 @test16(i1 %cnd) {
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; CHECK-LABEL: define i32 @test16(
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; CHECK: load atomic i32, i32* %addr monotonic, align 4
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%addr = select i1 %cnd, i32* @a, i32* @b
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%x = load atomic i32, i32* %addr monotonic, align 4
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ret i32 %x
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}
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; FIXME: This would be legal to transform
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define i32 @test17(i1 %cnd) {
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; CHECK-LABEL: define i32 @test17(
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; CHECK: load atomic i32, i32* %addr seq_cst, align 4
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%addr = select i1 %cnd, i32* @a, i32* @b
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%x = load atomic i32, i32* %addr seq_cst, align 4
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ret i32 %x
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}
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define i32 @test22(i1 %cnd) {
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; CHECK-LABEL: define i32 @test22(
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; CHECK: [[PHI:%.*]] = phi i32
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; CHECK: store atomic i32 [[PHI]], i32* @a unordered, align 4
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br i1 %cnd, label %block1, label %block2
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block1:
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store atomic i32 1, i32* @a unordered, align 4
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br label %merge
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block2:
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store atomic i32 2, i32* @a unordered, align 4
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br label %merge
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merge:
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ret i32 0
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}
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; TODO: probably also legal here
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define i32 @test23(i1 %cnd) {
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; CHECK-LABEL: define i32 @test23(
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; CHECK: br i1 %cnd, label %block1, label %block2
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br i1 %cnd, label %block1, label %block2
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block1:
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store atomic i32 1, i32* @a monotonic, align 4
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br label %merge
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block2:
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store atomic i32 2, i32* @a monotonic, align 4
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br label %merge
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merge:
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ret i32 0
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}
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declare void @clobber()
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define i32 @test18(float* %p) {
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; CHECK-LABEL: define i32 @test18(
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; CHECK: load atomic i32, i32* [[A:%.*]] unordered, align 4
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; CHECK: store atomic i32 [[B:%.*]], i32* [[C:%.*]] unordered, align 4
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%x = load atomic float, float* %p unordered, align 4
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call void @clobber() ;; keep the load around
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store atomic float %x, float* %p unordered, align 4
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ret i32 0
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}
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; TODO: probably also legal in this case
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define i32 @test19(float* %p) {
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; CHECK-LABEL: define i32 @test19(
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; CHECK: load atomic float, float* %p seq_cst, align 4
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; CHECK: store atomic float %x, float* %p seq_cst, align 4
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%x = load atomic float, float* %p seq_cst, align 4
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call void @clobber() ;; keep the load around
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store atomic float %x, float* %p seq_cst, align 4
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ret i32 0
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}
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define i32 @test20(i32** %p, i8* %v) {
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; CHECK-LABEL: define i32 @test20(
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; CHECK: store atomic i8* %v, i8** [[D:%.*]] unordered, align 4
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%cast = bitcast i8* %v to i32*
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store atomic i32* %cast, i32** %p unordered, align 4
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ret i32 0
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}
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define i32 @test21(i32** %p, i8* %v) {
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; CHECK-LABEL: define i32 @test21(
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; CHECK: store atomic i32* %cast, i32** %p monotonic, align 4
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%cast = bitcast i8* %v to i32*
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store atomic i32* %cast, i32** %p monotonic, align 4
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ret i32 0
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}
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define void @pr27490a(i8** %p1, i8** %p2) {
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; CHECK-LABEL: define void @pr27490
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; CHECK: %1 = bitcast i8** %p1 to i64*
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; CHECK: %l1 = load i64, i64* %1, align 8
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; CHECK: %2 = bitcast i8** %p2 to i64*
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; CHECK: store volatile i64 %l1, i64* %2, align 8
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%l = load i8*, i8** %p1
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store volatile i8* %l, i8** %p2
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ret void
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}
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define void @pr27490b(i8** %p1, i8** %p2) {
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; CHECK-LABEL: define void @pr27490
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; CHECK: %1 = bitcast i8** %p1 to i64*
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; CHECK: %l1 = load i64, i64* %1, align 8
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; CHECK: %2 = bitcast i8** %p2 to i64*
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; CHECK: store atomic i64 %l1, i64* %2 seq_cst, align 8
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%l = load i8*, i8** %p1
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store atomic i8* %l, i8** %p2 seq_cst, align 8
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ret void
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}
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;; At the moment, we can't form atomic vectors by folding since these are
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;; not representable in the IR. This was pr29121. The right long term
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;; solution is to extend the IR to handle this case.
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define <2 x float> @no_atomic_vector_load(i64* %p) {
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; CHECK-LABEL: @no_atomic_vector_load
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; CHECK: load atomic i64, i64* %p unordered, align 8
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%load = load atomic i64, i64* %p unordered, align 8
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%.cast = bitcast i64 %load to <2 x float>
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ret <2 x float> %.cast
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}
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define void @no_atomic_vector_store(<2 x float> %p, i8* %p2) {
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; CHECK-LABEL: @no_atomic_vector_store
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; CHECK: store atomic i64 %1, i64* %2 unordered, align 8
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%1 = bitcast <2 x float> %p to i64
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%2 = bitcast i8* %p2 to i64*
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store atomic i64 %1, i64* %2 unordered, align 8
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ret void
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}
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attributes #0 = { "null-pointer-is-valid"="true" }
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