101 lines
2.9 KiB
LLVM
101 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=riscv64 -mattr=+m -verify-machineinstrs < %s | FileCheck %s
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; This test has multiple opportunities for SimplifyDemandedBits after type
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; legalization. There are 2 opportunities on the chain feeding the LHS of the
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; shl. And one opportunity on the shift amount. We previously weren't managing
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; the DAGCombiner worklist correctly and failed to get the RHS.
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define i32 @foo(i32 %x, i32 %y, i32 %z) {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0:
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; CHECK-NEXT: mulw a0, a0, a0
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; CHECK-NEXT: addiw a0, a0, 1
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; CHECK-NEXT: mulw a0, a0, a0
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; CHECK-NEXT: addw a0, a0, a2
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; CHECK-NEXT: addiw a0, a0, 1
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; CHECK-NEXT: sllw a0, a0, a1
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; CHECK-NEXT: ret
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%b = mul i32 %x, %x
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%c = add i32 %b, 1
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%d = mul i32 %c, %c
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%e = add i32 %d, %z
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%f = add i32 %e, 1
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%g = shl i32 %f, %y
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ret i32 %g
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}
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; The sign bit of an nsw self multiply is 0. Make sure we can use this to
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; convert the AND constant to -8.
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define i64 @mul_self_nsw_sign(i64 %x) {
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; CHECK-LABEL: mul_self_nsw_sign:
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; CHECK: # %bb.0:
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; CHECK-NEXT: mul a0, a0, a0
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; CHECK-NEXT: andi a0, a0, -8
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; CHECK-NEXT: ret
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%a = mul nsw i64 %x, %x
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%b = and i64 %a, 9223372036854775800
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ret i64 %b
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}
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; Make sure we sign extend the constant after type legalization to allow the
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; use of ori.
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define void @ori(ptr nocapture noundef %0) {
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; CHECK-LABEL: ori:
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; CHECK: # %bb.0:
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; CHECK-NEXT: lw a1, 0(a0)
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; CHECK-NEXT: ori a1, a1, -2
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; CHECK-NEXT: sw a1, 0(a0)
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; CHECK-NEXT: ret
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%2 = load i32, ptr %0, align 4
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%3 = or i32 %2, -2
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store i32 %3, ptr %0, align 4
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ret void
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}
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; Make sure we sign extend the constant after type legalization to allow the
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; use of xori.
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define void @xori(ptr nocapture noundef %0) {
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; CHECK-LABEL: xori:
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; CHECK: # %bb.0:
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; CHECK-NEXT: lw a1, 0(a0)
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; CHECK-NEXT: xori a1, a1, -5
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; CHECK-NEXT: sw a1, 0(a0)
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; CHECK-NEXT: ret
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%2 = load i32, ptr %0, align 4
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%3 = xor i32 %2, -5
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store i32 %3, ptr %0, align 4
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ret void
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}
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; Make sure we sign extend the constant after type legalization to allow the
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; shorter constant materialization.
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define void @or_signbit(ptr nocapture noundef %0) {
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; CHECK-LABEL: or_signbit:
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; CHECK: # %bb.0:
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; CHECK-NEXT: lw a1, 0(a0)
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; CHECK-NEXT: lui a2, 524288
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; CHECK-NEXT: or a1, a1, a2
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; CHECK-NEXT: sw a1, 0(a0)
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; CHECK-NEXT: ret
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%2 = load i32, ptr %0, align 4
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%3 = or i32 %2, -2147483648
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store i32 %3, ptr %0, align 4
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ret void
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}
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; Make sure we sign extend the constant after type legalization to allow the
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; shorter constant materialization.
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define void @xor_signbit(ptr nocapture noundef %0) {
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; CHECK-LABEL: xor_signbit:
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; CHECK: # %bb.0:
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; CHECK-NEXT: lw a1, 0(a0)
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; CHECK-NEXT: lui a2, 524288
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; CHECK-NEXT: xor a1, a1, a2
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; CHECK-NEXT: sw a1, 0(a0)
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; CHECK-NEXT: ret
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%2 = load i32, ptr %0, align 4
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%3 = xor i32 %2, -2147483648
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store i32 %3, ptr %0, align 4
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ret void
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}
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