| ; This test makes sure that mul instructions are properly eliminated. |
| ; RUN: opt < %s -instcombine -S | not grep mul |
| |
| define i32 @test1(i32 %A) { |
| %B = mul i32 %A, 1 ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define i32 @test2(i32 %A) { |
| ; Should convert to an add instruction |
| %B = mul i32 %A, 2 ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define i32 @test3(i32 %A) { |
| ; This should disappear entirely |
| %B = mul i32 %A, 0 ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define double @test4(double %A) { |
| ; This is safe for FP |
| %B = fmul double 1.000000e+00, %A ; <double> [#uses=1] |
| ret double %B |
| } |
| |
| define i32 @test5(i32 %A) { |
| %B = mul i32 %A, 8 ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define i8 @test6(i8 %A) { |
| %B = mul i8 %A, 8 ; <i8> [#uses=1] |
| %C = mul i8 %B, 8 ; <i8> [#uses=1] |
| ret i8 %C |
| } |
| |
| define i32 @test7(i32 %i) { |
| %tmp = mul i32 %i, -1 ; <i32> [#uses=1] |
| ret i32 %tmp |
| } |
| |
| define i64 @test8(i64 %i) { |
| ; tmp = sub 0, %i |
| %j = mul i64 %i, -1 ; <i64> [#uses=1] |
| ret i64 %j |
| } |
| |
| define i32 @test9(i32 %i) { |
| ; %j = sub 0, %i |
| %j = mul i32 %i, -1 ; <i32> [#uses=1] |
| ret i32 %j |
| } |
| |
| define i32 @test10(i32 %a, i32 %b) { |
| %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 |
| } |
| |
| define i32 @test11(i32 %a, i32 %b) { |
| %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 |
| } |
| |
| define i32 @test12(i8 %a, i32 %b) { |
| %c = icmp ugt i8 %a, 127 ; <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 |
| } |
| |
| ; PR2642 |
| define internal void @test13(<4 x float>*) { |
| 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 |
| } |
| |
| define <16 x i8> @test14(<16 x i8> %a) { |
| %b = mul <16 x i8> %a, zeroinitializer |
| ret <16 x i8> %b |
| } |
| |
| ; rdar://7293527 |
| define i32 @test15(i32 %A, i32 %B) { |
| entry: |
| %shl = shl i32 1, %B |
| %m = mul i32 %shl, %A |
| ret i32 %m |
| } |
| |
| ; X * Y (when Y is 0 or 1) --> x & (0-Y) |
| define i32 @test16(i32 %b, i1 %c) { |
| %d = zext i1 %c to i32 ; <i32> [#uses=1] |
| ; e = b & (a >> 31) |
| %e = mul i32 %d, %b ; <i32> [#uses=1] |
| ret i32 %e |
| } |
| |
| ; X * Y (when Y is 0 or 1) --> x & (0-Y) |
| define i32 @test17(i32 %a, i32 %b) { |
| %a.lobit = lshr i32 %a, 31 |
| %e = mul i32 %a.lobit, %b |
| ret i32 %e |
| } |
| |
| |
| |