1; Test that the ffs* library call simplifier works correctly. 2; 3; RUN: opt < %s -instcombine -S | FileCheck %s 4; RUN: opt < %s -mtriple i386-pc-linux -instcombine -S | FileCheck %s -check-prefix=CHECK-LINUX 5 6target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" 7 8declare i32 @ffs(i32) 9declare i32 @ffsl(i32) 10declare i32 @ffsll(i64) 11 12; Check ffs(0) -> 0. 13 14define i32 @test_simplify1() { 15; CHECK-LABEL: @test_simplify1( 16 %ret = call i32 @ffs(i32 0) 17 ret i32 %ret 18; CHECK-NEXT: ret i32 0 19} 20 21define i32 @test_simplify2() { 22; CHECK-LINUX-LABEL: @test_simplify2( 23 %ret = call i32 @ffsl(i32 0) 24 ret i32 %ret 25; CHECK-LINUX-NEXT: ret i32 0 26} 27 28define i32 @test_simplify3() { 29; CHECK-LINUX-LABEL: @test_simplify3( 30 %ret = call i32 @ffsll(i64 0) 31 ret i32 %ret 32; CHECK-LINUX-NEXT: ret i32 0 33} 34 35; Check ffs(c) -> cttz(c) + 1, where 'c' is a constant. 36 37define i32 @test_simplify4() { 38; CHECK-LABEL: @test_simplify4( 39 %ret = call i32 @ffs(i32 1) 40 ret i32 %ret 41; CHECK-NEXT: ret i32 1 42} 43 44define i32 @test_simplify5() { 45; CHECK-LABEL: @test_simplify5( 46 %ret = call i32 @ffs(i32 2048) 47 ret i32 %ret 48; CHECK-NEXT: ret i32 12 49} 50 51define i32 @test_simplify6() { 52; CHECK-LABEL: @test_simplify6( 53 %ret = call i32 @ffs(i32 65536) 54 ret i32 %ret 55; CHECK-NEXT: ret i32 17 56} 57 58define i32 @test_simplify7() { 59; CHECK-LINUX-LABEL: @test_simplify7( 60 %ret = call i32 @ffsl(i32 65536) 61 ret i32 %ret 62; CHECK-LINUX-NEXT: ret i32 17 63} 64 65define i32 @test_simplify8() { 66; CHECK-LINUX-LABEL: @test_simplify8( 67 %ret = call i32 @ffsll(i64 1024) 68 ret i32 %ret 69; CHECK-LINUX-NEXT: ret i32 11 70} 71 72define i32 @test_simplify9() { 73; CHECK-LINUX-LABEL: @test_simplify9( 74 %ret = call i32 @ffsll(i64 65536) 75 ret i32 %ret 76; CHECK-LINUX-NEXT: ret i32 17 77} 78 79define i32 @test_simplify10() { 80; CHECK-LINUX-LABEL: @test_simplify10( 81 %ret = call i32 @ffsll(i64 17179869184) 82 ret i32 %ret 83; CHECK-LINUX-NEXT: ret i32 35 84} 85 86define i32 @test_simplify11() { 87; CHECK-LINUX-LABEL: @test_simplify11( 88 %ret = call i32 @ffsll(i64 281474976710656) 89 ret i32 %ret 90; CHECK-LINUX-NEXT: ret i32 49 91} 92 93define i32 @test_simplify12() { 94; CHECK-LINUX-LABEL: @test_simplify12( 95 %ret = call i32 @ffsll(i64 1152921504606846976) 96 ret i32 %ret 97; CHECK-LINUX-NEXT: ret i32 61 98} 99 100; Check ffs(x) -> x != 0 ? (i32)llvm.cttz(x) + 1 : 0. 101 102define i32 @test_simplify13(i32 %x) { 103; CHECK-LABEL: @test_simplify13( 104 %ret = call i32 @ffs(i32 %x) 105; CHECK-NEXT: [[CTTZ:%[a-z0-9]+]] = call i32 @llvm.cttz.i32(i32 %x, i1 false) 106; CHECK-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i32 [[CTTZ]], 1 107; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i32 %x, 0 108; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[INC]], i32 0 109 ret i32 %ret 110; CHECK-NEXT: ret i32 [[RET]] 111} 112 113define i32 @test_simplify14(i32 %x) { 114; CHECK-LINUX-LABEL: @test_simplify14( 115 %ret = call i32 @ffsl(i32 %x) 116; CHECK-LINUX-NEXT: [[CTTZ:%[a-z0-9]+]] = call i32 @llvm.cttz.i32(i32 %x, i1 false) 117; CHECK-LINUX-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i32 [[CTTZ]], 1 118; CHECK-LINUX-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i32 %x, 0 119; CHECK-LINUX-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[INC]], i32 0 120 ret i32 %ret 121; CHECK-LINUX-NEXT: ret i32 [[RET]] 122} 123 124define i32 @test_simplify15(i64 %x) { 125; CHECK-LINUX-LABEL: @test_simplify15( 126 %ret = call i32 @ffsll(i64 %x) 127; CHECK-LINUX-NEXT: [[CTTZ:%[a-z0-9]+]] = call i64 @llvm.cttz.i64(i64 %x, i1 false) 128; CHECK-LINUX-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i64 [[CTTZ]], 1 129; CHECK-LINUX-NEXT: [[TRUNC:%[a-z0-9]+]] = trunc i64 [[INC]] to i32 130; CHECK-LINUX-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i64 %x, 0 131; CHECK-LINUX-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[TRUNC]], i32 0 132 ret i32 %ret 133; CHECK-LINUX-NEXT: ret i32 [[RET]] 134} 135