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; This test makes sure that mul instructions are properly eliminated.
; 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) {
; CHECK: @test8
%j = mul i64 %i, -1 ; <i64> [#uses=1]
ret i64 %j
; CHECK: sub i64 0, %i
}
define i32 @test9(i32 %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(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 = 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
}
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