diff options
Diffstat (limited to 'test')
-rw-r--r-- | test/Transforms/InstCombine/mul.ll | 80 |
1 files changed, 74 insertions, 6 deletions
diff --git a/test/Transforms/InstCombine/mul.ll b/test/Transforms/InstCombine/mul.ll index 53a5643..edb5305 100644 --- a/test/Transforms/InstCombine/mul.ll +++ b/test/Transforms/InstCombine/mul.ll @@ -1,116 +1,184 @@ ; This test makes sure that mul instructions are properly eliminated. -; RUN: opt < %s -instcombine -S | not grep mul +; RUN: opt < %s -instcombine -S | FileCheck %s define i32 @test1(i32 %A) { +; CHECK: @test1 %B = mul i32 %A, 1 ; <i32> [#uses=1] ret i32 %B +; CHECK: ret i32 %A } define i32 @test2(i32 %A) { +; CHECK: @test2 ; Should convert to an add instruction %B = mul i32 %A, 2 ; <i32> [#uses=1] ret i32 %B +; CHECK: shl i32 %A, 1 } define i32 @test3(i32 %A) { +; CHECK: @test3 ; This should disappear entirely %B = mul i32 %A, 0 ; <i32> [#uses=1] ret i32 %B +; CHECK: ret i32 0 } define double @test4(double %A) { +; CHECK: @test4 ; This is safe for FP %B = fmul double 1.000000e+00, %A ; <double> [#uses=1] ret double %B +; CHECK: ret double %A } define i32 @test5(i32 %A) { +; CHECK: @test5 %B = mul i32 %A, 8 ; <i32> [#uses=1] ret i32 %B +; CHECK: shl i32 %A, 3 } define i8 @test6(i8 %A) { +; CHECK: @test6 %B = mul i8 %A, 8 ; <i8> [#uses=1] %C = mul i8 %B, 8 ; <i8> [#uses=1] ret i8 %C +; CHECK: shl i8 %A, 6 } define i32 @test7(i32 %i) { +; CHECK: @test7 %tmp = mul i32 %i, -1 ; <i32> [#uses=1] ret i32 %tmp +; CHECK: sub i32 0, %i } define i64 @test8(i64 %i) { - ; tmp = sub 0, %i +; CHECK: @test8 %j = mul i64 %i, -1 ; <i64> [#uses=1] ret i64 %j +; CHECK: sub i64 0, %i } define i32 @test9(i32 %i) { - ; %j = sub 0, %i +; CHECK: @test9 %j = mul i32 %i, -1 ; <i32> [#uses=1] ret i32 %j +; CHECJ: sub i32 0, %i } define i32 @test10(i32 %a, i32 %b) { +; CHECK: @test10 %c = icmp slt i32 %a, 0 ; <i1> [#uses=1] %d = zext i1 %c to i32 ; <i32> [#uses=1] ; e = b & (a >> 31) %e = mul i32 %d, %b ; <i32> [#uses=1] ret i32 %e +; CHECK: [[TEST10:%.*]] = ashr i32 %a, 31 +; CHECK-NEXT: %e = and i32 [[TEST10]], %b +; CHECK-NEXT: ret i32 %e } define i32 @test11(i32 %a, i32 %b) { +; CHECK: @test11 %c = icmp sle i32 %a, -1 ; <i1> [#uses=1] %d = zext i1 %c to i32 ; <i32> [#uses=1] ; e = b & (a >> 31) %e = mul i32 %d, %b ; <i32> [#uses=1] ret i32 %e +; CHECK: [[TEST11:%.*]] = ashr i32 %a, 31 +; CHECK-NEXT: %e = and i32 [[TEST11]], %b +; CHECK-NEXT: ret i32 %e } -define i32 @test12(i8 %a, i32 %b) { - %c = icmp ugt i8 %a, 127 ; <i1> [#uses=1] +define i32 @test12(i32 %a, i32 %b) { +; CHECK: @test12 + %c = icmp ugt i32 %a, 2147483647 ; <i1> [#uses=1] %d = zext i1 %c to i32 ; <i32> [#uses=1] - ; e = b & (a >> 31) %e = mul i32 %d, %b ; <i32> [#uses=1] ret i32 %e +; CHECK: [[TEST12:%.*]] = ashr i32 %a, 31 +; CHECK-NEXT: %e = and i32 [[TEST12]], %b +; CHECK-NEXT: ret i32 %e + } ; PR2642 define internal void @test13(<4 x float>*) { +; CHECK: @test13 load <4 x float>* %0, align 1 fmul <4 x float> %2, < float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00 > store <4 x float> %3, <4 x float>* %0, align 1 ret void +; CHECK-NEXT: ret void } define <16 x i8> @test14(<16 x i8> %a) { +; CHECK: @test14 %b = mul <16 x i8> %a, zeroinitializer ret <16 x i8> %b +; CHECK-NEXT: ret <16 x i8> zeroinitializer } ; rdar://7293527 define i32 @test15(i32 %A, i32 %B) { +; CHECK: @test15 entry: %shl = shl i32 1, %B %m = mul i32 %shl, %A ret i32 %m +; CHECK: shl i32 %A, %B } ; X * Y (when Y is 0 or 1) --> x & (0-Y) define i32 @test16(i32 %b, i1 %c) { +; CHECK: @test16 %d = zext i1 %c to i32 ; <i32> [#uses=1] ; e = b & (a >> 31) %e = mul i32 %d, %b ; <i32> [#uses=1] ret i32 %e +; CHECK: [[TEST16:%.*]] = sext i1 %c to i32 +; CHECK-NEXT: %e = and i32 [[TEST16]], %b +; CHECK-NEXT: ret i32 %e } ; X * Y (when Y is 0 or 1) --> x & (0-Y) define i32 @test17(i32 %a, i32 %b) { +; CHECK: @test17 %a.lobit = lshr i32 %a, 31 %e = mul i32 %a.lobit, %b ret i32 %e +; CHECK: [[TEST17:%.*]] = ashr i32 %a, 31 +; CHECK-NEXT: %e = and i32 [[TEST17]], %b +; CHECK-NEXT: ret i32 %e +} + +define i32 @test18(i32 %A, i32 %B) { +; CHECK: @test18 + %C = and i32 %A, 1 + %D = and i32 %B, 1 + + %E = mul i32 %C, %D + %F = and i32 %E, 16 + ret i32 %F +; CHECK-NEXT: ret i32 0 } +declare {i32, i1} @llvm.smul.with.overflow.i32(i32, i32) +declare void @use(i1) +define i32 @test19(i32 %A, i32 %B) { +; CHECK: @test19 + %C = and i32 %A, 1 + %D = and i32 %B, 1 +; It would be nice if we also started proving that this doesn't overflow. + %E = call {i32, i1} @llvm.smul.with.overflow.i32(i32 %C, i32 %D) + %F = extractvalue {i32, i1} %E, 0 + %G = extractvalue {i32, i1} %E, 1 + call void @use(i1 %G) + %H = and i32 %F, 16 + ret i32 %H +; CHECK: ret i32 0 +} |