194 lines
5.4 KiB
LLVM
194 lines
5.4 KiB
LLVM
; Test that the ffs* library call simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s --check-prefix=ALL --check-prefix=GENERIC
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; RUN: opt < %s -instcombine -mtriple i386-pc-linux -S | FileCheck %s --check-prefix=ALL --check-prefix=TARGET
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; RUN: opt < %s -instcombine -mtriple=arm64-apple-ios9.0 -S | FileCheck %s --check-prefix=ALL --check-prefix=TARGET
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; RUN: opt < %s -instcombine -mtriple=arm64-apple-tvos9.0 -S | FileCheck %s --check-prefix=ALL --check-prefix=TARGET
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; RUN: opt < %s -instcombine -mtriple=thumbv7k-apple-watchos2.0 -S | FileCheck %s --check-prefix=ALL --check-prefix=TARGET
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; RUN: opt < %s -instcombine -mtriple=x86_64-apple-macosx10.11 -S | FileCheck %s --check-prefix=ALL --check-prefix=TARGET
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; RUN: opt < %s -instcombine -mtriple=x86_64-freebsd-gnu -S | FileCheck %s --check-prefix=ALL --check-prefix=TARGET
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declare i32 @ffs(i32)
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declare i32 @ffsl(i32)
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declare i32 @ffsll(i64)
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; Check ffs(0) -> 0.
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define i32 @test_simplify1() {
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; ALL-LABEL: @test_simplify1(
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; ALL-NEXT: ret i32 0
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;
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%ret = call i32 @ffs(i32 0)
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ret i32 %ret
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}
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define i32 @test_simplify2() {
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; GENERIC-LABEL: @test_simplify2(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsl(i32 0)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify2(
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; TARGET-NEXT: ret i32 0
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;
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%ret = call i32 @ffsl(i32 0)
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ret i32 %ret
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}
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define i32 @test_simplify3() {
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; GENERIC-LABEL: @test_simplify3(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsll(i64 0)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify3(
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; TARGET-NEXT: ret i32 0
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;
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%ret = call i32 @ffsll(i64 0)
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ret i32 %ret
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}
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; Check ffs(c) -> cttz(c) + 1, where 'c' is a constant.
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define i32 @test_simplify4() {
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; ALL-LABEL: @test_simplify4(
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; ALL-NEXT: ret i32 1
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;
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%ret = call i32 @ffs(i32 1)
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ret i32 %ret
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}
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define i32 @test_simplify5() {
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; ALL-LABEL: @test_simplify5(
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; ALL-NEXT: ret i32 12
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;
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%ret = call i32 @ffs(i32 2048)
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ret i32 %ret
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}
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define i32 @test_simplify6() {
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; ALL-LABEL: @test_simplify6(
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; ALL-NEXT: ret i32 17
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;
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%ret = call i32 @ffs(i32 65536)
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ret i32 %ret
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}
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define i32 @test_simplify7() {
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; GENERIC-LABEL: @test_simplify7(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsl(i32 65536)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify7(
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; TARGET-NEXT: ret i32 17
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;
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%ret = call i32 @ffsl(i32 65536)
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ret i32 %ret
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}
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define i32 @test_simplify8() {
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; GENERIC-LABEL: @test_simplify8(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsll(i64 1024)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify8(
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; TARGET-NEXT: ret i32 11
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;
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%ret = call i32 @ffsll(i64 1024)
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ret i32 %ret
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}
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define i32 @test_simplify9() {
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; GENERIC-LABEL: @test_simplify9(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsll(i64 65536)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify9(
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; TARGET-NEXT: ret i32 17
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;
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%ret = call i32 @ffsll(i64 65536)
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ret i32 %ret
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}
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define i32 @test_simplify10() {
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; GENERIC-LABEL: @test_simplify10(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsll(i64 17179869184)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify10(
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; TARGET-NEXT: ret i32 35
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;
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%ret = call i32 @ffsll(i64 17179869184)
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ret i32 %ret
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}
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define i32 @test_simplify11() {
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; GENERIC-LABEL: @test_simplify11(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsll(i64 281474976710656)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify11(
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; TARGET-NEXT: ret i32 49
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;
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%ret = call i32 @ffsll(i64 281474976710656)
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ret i32 %ret
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}
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define i32 @test_simplify12() {
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; GENERIC-LABEL: @test_simplify12(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsll(i64 1152921504606846976)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify12(
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; TARGET-NEXT: ret i32 61
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;
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%ret = call i32 @ffsll(i64 1152921504606846976)
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ret i32 %ret
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}
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; Check ffs(x) -> x != 0 ? (i32)llvm.cttz(x) + 1 : 0.
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define i32 @test_simplify13(i32 %x) {
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; ALL-LABEL: @test_simplify13(
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; ALL-NEXT: [[CTTZ:%.*]] = call i32 @llvm.cttz.i32(i32 %x, i1 true), !range !0
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; ALL-NEXT: [[TMP1:%.*]] = add nuw nsw i32 [[CTTZ]], 1
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; ALL-NEXT: [[TMP2:%.*]] = icmp eq i32 %x, 0
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; ALL-NEXT: [[TMP3:%.*]] = select i1 [[TMP2]], i32 0, i32 [[TMP1]]
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; ALL-NEXT: ret i32 [[TMP3]]
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;
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%ret = call i32 @ffs(i32 %x)
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ret i32 %ret
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}
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define i32 @test_simplify14(i32 %x) {
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; GENERIC-LABEL: @test_simplify14(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsl(i32 %x)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify14(
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; TARGET-NEXT: [[CTTZ:%.*]] = call i32 @llvm.cttz.i32(i32 %x, i1 true), !range !0
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; TARGET-NEXT: [[TMP1:%.*]] = add nuw nsw i32 [[CTTZ]], 1
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; TARGET-NEXT: [[TMP2:%.*]] = icmp eq i32 %x, 0
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; TARGET-NEXT: [[TMP3:%.*]] = select i1 [[TMP2]], i32 0, i32 [[TMP1]]
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; TARGET-NEXT: ret i32 [[TMP3]]
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;
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%ret = call i32 @ffsl(i32 %x)
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ret i32 %ret
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}
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define i32 @test_simplify15(i64 %x) {
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; GENERIC-LABEL: @test_simplify15(
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; GENERIC-NEXT: [[RET:%.*]] = call i32 @ffsll(i64 %x)
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; GENERIC-NEXT: ret i32 [[RET]]
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;
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; TARGET-LABEL: @test_simplify15(
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; TARGET-NEXT: [[CTTZ:%.*]] = call i64 @llvm.cttz.i64(i64 %x, i1 true), !range !1
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; TARGET-NEXT: [[TMP1:%.*]] = trunc i64 [[CTTZ]] to i32
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; TARGET-NEXT: [[TMP2:%.*]] = add nuw nsw i32 [[TMP1]], 1
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; TARGET-NEXT: [[TMP3:%.*]] = icmp eq i64 %x, 0
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; TARGET-NEXT: [[TMP4:%.*]] = select i1 [[TMP3]], i32 0, i32 [[TMP2]]
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; TARGET-NEXT: ret i32 [[TMP4]]
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;
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%ret = call i32 @ffsll(i64 %x)
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ret i32 %ret
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}
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