| ; Test that the ffs* library call simplifier works correctly. |
| ; |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| ; RUN: opt < %s -mtriple i386-pc-linux -instcombine -S | FileCheck %s -check-prefix=CHECK-FFS |
| ; RUN: opt -instcombine -mtriple=arm64-apple-ios9.0 -S %s | FileCheck --check-prefix=CHECK-FFS %s |
| ; RUN: opt -instcombine -mtriple=arm64-apple-tvos9.0 -S %s | FileCheck --check-prefix=CHECK-FFS %s |
| ; RUN: opt -instcombine -mtriple=thumbv7k-apple-watchos2.0 -S %s | FileCheck --check-prefix=CHECK-FFS %s |
| ; RUN: opt -instcombine -mtriple=x86_64-apple-macosx10.11 -S %s | FileCheck --check-prefix=CHECK-FFS %s |
| ; RUN: opt -instcombine -mtriple=x86_64-freebsd-gnu -S %s | FileCheck --check-prefix=CHECK-FFS %s |
| |
| declare i32 @ffs(i32) |
| declare i32 @ffsl(i32) |
| declare i32 @ffsll(i64) |
| |
| ; Check ffs(0) -> 0. |
| |
| define i32 @test_simplify1() { |
| ; CHECK-LABEL: @test_simplify1( |
| %ret = call i32 @ffs(i32 0) |
| ret i32 %ret |
| ; CHECK-NEXT: ret i32 0 |
| } |
| |
| define i32 @test_simplify2() { |
| ; CHECK-FFS-LABEL: @test_simplify2( |
| %ret = call i32 @ffsl(i32 0) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 0 |
| } |
| |
| define i32 @test_simplify3() { |
| ; CHECK-FFS-LABEL: @test_simplify3( |
| %ret = call i32 @ffsll(i64 0) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 0 |
| } |
| |
| ; Check ffs(c) -> cttz(c) + 1, where 'c' is a constant. |
| |
| define i32 @test_simplify4() { |
| ; CHECK-LABEL: @test_simplify4( |
| %ret = call i32 @ffs(i32 1) |
| ret i32 %ret |
| ; CHECK-NEXT: ret i32 1 |
| } |
| |
| define i32 @test_simplify5() { |
| ; CHECK-LABEL: @test_simplify5( |
| %ret = call i32 @ffs(i32 2048) |
| ret i32 %ret |
| ; CHECK-NEXT: ret i32 12 |
| } |
| |
| define i32 @test_simplify6() { |
| ; CHECK-LABEL: @test_simplify6( |
| %ret = call i32 @ffs(i32 65536) |
| ret i32 %ret |
| ; CHECK-NEXT: ret i32 17 |
| } |
| |
| define i32 @test_simplify7() { |
| ; CHECK-FFS-LABEL: @test_simplify7( |
| %ret = call i32 @ffsl(i32 65536) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 17 |
| } |
| |
| define i32 @test_simplify8() { |
| ; CHECK-FFS-LABEL: @test_simplify8( |
| %ret = call i32 @ffsll(i64 1024) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 11 |
| } |
| |
| define i32 @test_simplify9() { |
| ; CHECK-FFS-LABEL: @test_simplify9( |
| %ret = call i32 @ffsll(i64 65536) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 17 |
| } |
| |
| define i32 @test_simplify10() { |
| ; CHECK-FFS-LABEL: @test_simplify10( |
| %ret = call i32 @ffsll(i64 17179869184) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 35 |
| } |
| |
| define i32 @test_simplify11() { |
| ; CHECK-FFS-LABEL: @test_simplify11( |
| %ret = call i32 @ffsll(i64 281474976710656) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 49 |
| } |
| |
| define i32 @test_simplify12() { |
| ; CHECK-FFS-LABEL: @test_simplify12( |
| %ret = call i32 @ffsll(i64 1152921504606846976) |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 61 |
| } |
| |
| ; Check ffs(x) -> x != 0 ? (i32)llvm.cttz(x) + 1 : 0. |
| |
| define i32 @test_simplify13(i32 %x) { |
| ; CHECK-LABEL: @test_simplify13( |
| %ret = call i32 @ffs(i32 %x) |
| ; CHECK-NEXT: [[CTTZ:%[a-z0-9]+]] = call i32 @llvm.cttz.i32(i32 %x, i1 true) |
| ; CHECK-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i32 [[CTTZ]], 1 |
| ; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i32 %x, 0 |
| ; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[INC]], i32 0 |
| ret i32 %ret |
| ; CHECK-NEXT: ret i32 [[RET]] |
| } |
| |
| define i32 @test_simplify14(i32 %x) { |
| ; CHECK-FFS-LABEL: @test_simplify14( |
| %ret = call i32 @ffsl(i32 %x) |
| ; CHECK-FFS-NEXT: [[CTTZ:%[a-z0-9]+]] = call i32 @llvm.cttz.i32(i32 %x, i1 true) |
| ; CHECK-FFS-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i32 [[CTTZ]], 1 |
| ; CHECK-FFS-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i32 %x, 0 |
| ; CHECK-FFS-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[INC]], i32 0 |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 [[RET]] |
| } |
| |
| define i32 @test_simplify15(i64 %x) { |
| ; CHECK-FFS-LABEL: @test_simplify15( |
| %ret = call i32 @ffsll(i64 %x) |
| ; CHECK-FFS-NEXT: [[CTTZ:%[a-z0-9]+]] = call i64 @llvm.cttz.i64(i64 %x, i1 true) |
| ; CHECK-FFS-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i64 [[CTTZ]], 1 |
| ; CHECK-FFS-NEXT: [[TRUNC:%[a-z0-9]+]] = trunc i64 [[INC]] to i32 |
| ; CHECK-FFS-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i64 %x, 0 |
| ; CHECK-FFS-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[TRUNC]], i32 0 |
| ret i32 %ret |
| ; CHECK-FFS-NEXT: ret i32 [[RET]] |
| } |