mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-25 00:29:20 +00:00
a4a812fedd
We can only propagate the nsw bits if both subtraction instructions are marked with the appropriate bit. N.B. We only propagate the nsw bit in InstCombine because the nuw case is already handled in InstSimplify. This fixes PR20189. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214385 91177308-0d34-0410-b5e6-96231b3b80d8
476 lines
11 KiB
LLVM
476 lines
11 KiB
LLVM
target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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; Optimize subtracts.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test1(i32 %A) {
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%B = sub i32 %A, %A
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ret i32 %B
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; CHECK-LABEL: @test1(
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; CHECK: ret i32 0
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}
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define i32 @test2(i32 %A) {
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%B = sub i32 %A, 0
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ret i32 %B
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; CHECK-LABEL: @test2(
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; CHECK: ret i32 %A
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}
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define i32 @test3(i32 %A) {
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%B = sub i32 0, %A
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%C = sub i32 0, %B
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ret i32 %C
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; CHECK-LABEL: @test3(
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; CHECK: ret i32 %A
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}
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define i32 @test4(i32 %A, i32 %x) {
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%B = sub i32 0, %A
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%C = sub i32 %x, %B
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ret i32 %C
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; CHECK-LABEL: @test4(
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; CHECK: %C = add i32 %x, %A
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; CHECK: ret i32 %C
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}
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define i32 @test5(i32 %A, i32 %B, i32 %C) {
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%D = sub i32 %B, %C
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%E = sub i32 %A, %D
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ret i32 %E
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; CHECK-LABEL: @test5(
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; CHECK: %D1 = sub i32 %C, %B
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; CHECK: %E = add
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; CHECK: ret i32 %E
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}
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define i32 @test6(i32 %A, i32 %B) {
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%C = and i32 %A, %B
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%D = sub i32 %A, %C
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ret i32 %D
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: xor i32 %B, -1
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; CHECK-NEXT: %D = and i32
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; CHECK-NEXT: ret i32 %D
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}
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define i32 @test7(i32 %A) {
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%B = sub i32 -1, %A
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ret i32 %B
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; CHECK-LABEL: @test7(
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; CHECK: %B = xor i32 %A, -1
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; CHECK: ret i32 %B
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}
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define i32 @test8(i32 %A) {
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%B = mul i32 9, %A
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%C = sub i32 %B, %A
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ret i32 %C
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; CHECK-LABEL: @test8(
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; CHECK: %C = shl i32 %A, 3
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; CHECK: ret i32 %C
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}
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define i32 @test9(i32 %A) {
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%B = mul i32 3, %A
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%C = sub i32 %A, %B
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ret i32 %C
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; CHECK-LABEL: @test9(
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; CHECK: %C = mul i32 %A, -2
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; CHECK: ret i32 %C
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}
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define i32 @test10(i32 %A, i32 %B) {
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%C = sub i32 0, %A
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%D = sub i32 0, %B
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%E = mul i32 %C, %D
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ret i32 %E
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; CHECK-LABEL: @test10(
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; CHECK: %E = mul i32 %A, %B
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; CHECK: ret i32 %E
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}
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define i32 @test10a(i32 %A) {
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%C = sub i32 0, %A
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%E = mul i32 %C, 7
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ret i32 %E
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; CHECK-LABEL: @test10a(
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; CHECK: %E = mul i32 %A, -7
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; CHECK: ret i32 %E
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}
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define i1 @test11(i8 %A, i8 %B) {
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%C = sub i8 %A, %B
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%cD = icmp ne i8 %C, 0
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ret i1 %cD
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; CHECK-LABEL: @test11(
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; CHECK: %cD = icmp ne i8 %A, %B
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; CHECK: ret i1 %cD
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}
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define i32 @test12(i32 %A) {
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%B = ashr i32 %A, 31
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%C = sub i32 0, %B
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ret i32 %C
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; CHECK-LABEL: @test12(
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; CHECK: %C = lshr i32 %A, 31
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; CHECK: ret i32 %C
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}
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define i32 @test13(i32 %A) {
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%B = lshr i32 %A, 31
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%C = sub i32 0, %B
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ret i32 %C
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; CHECK-LABEL: @test13(
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; CHECK: %C = ashr i32 %A, 31
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; CHECK: ret i32 %C
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}
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define i32 @test14(i32 %A) {
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%B = lshr i32 %A, 31
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%C = bitcast i32 %B to i32
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%D = sub i32 0, %C
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ret i32 %D
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; CHECK-LABEL: @test14(
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; CHECK: %D = ashr i32 %A, 31
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; CHECK: ret i32 %D
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}
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define i32 @test15(i32 %A, i32 %B) {
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%C = sub i32 0, %A
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%D = srem i32 %B, %C
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ret i32 %D
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; CHECK-LABEL: @test15(
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; CHECK: %D = srem i32 %B, %A
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; CHECK: ret i32 %D
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}
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define i32 @test16(i32 %A) {
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%X = sdiv i32 %A, 1123
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%Y = sub i32 0, %X
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ret i32 %Y
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; CHECK-LABEL: @test16(
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; CHECK: %Y = sdiv i32 %A, -1123
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; CHECK: ret i32 %Y
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}
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; Can't fold subtract here because negation it might oveflow.
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; PR3142
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define i32 @test17(i32 %A) {
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%B = sub i32 0, %A
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%C = sdiv i32 %B, 1234
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ret i32 %C
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; CHECK-LABEL: @test17(
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; CHECK: %B = sub i32 0, %A
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; CHECK: %C = sdiv i32 %B, 1234
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; CHECK: ret i32 %C
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}
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define i64 @test18(i64 %Y) {
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%tmp.4 = shl i64 %Y, 2
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%tmp.12 = shl i64 %Y, 2
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%tmp.8 = sub i64 %tmp.4, %tmp.12
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ret i64 %tmp.8
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; CHECK-LABEL: @test18(
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; CHECK: ret i64 0
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}
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define i32 @test19(i32 %X, i32 %Y) {
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%Z = sub i32 %X, %Y
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%Q = add i32 %Z, %Y
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ret i32 %Q
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; CHECK-LABEL: @test19(
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; CHECK: ret i32 %X
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}
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define i1 @test20(i32 %g, i32 %h) {
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%tmp.2 = sub i32 %g, %h
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%tmp.4 = icmp ne i32 %tmp.2, %g
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ret i1 %tmp.4
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; CHECK-LABEL: @test20(
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; CHECK: %tmp.4 = icmp ne i32 %h, 0
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; CHECK: ret i1 %tmp.4
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}
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define i1 @test21(i32 %g, i32 %h) {
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%tmp.2 = sub i32 %g, %h
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%tmp.4 = icmp ne i32 %tmp.2, %g
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ret i1 %tmp.4
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; CHECK-LABEL: @test21(
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; CHECK: %tmp.4 = icmp ne i32 %h, 0
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; CHECK: ret i1 %tmp.4
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}
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; PR2298
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define zeroext i1 @test22(i32 %a, i32 %b) nounwind {
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%tmp2 = sub i32 0, %a
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%tmp4 = sub i32 0, %b
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%tmp5 = icmp eq i32 %tmp2, %tmp4
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ret i1 %tmp5
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; CHECK-LABEL: @test22(
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; CHECK: %tmp5 = icmp eq i32 %b, %a
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; CHECK: ret i1 %tmp5
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}
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; rdar://7362831
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define i32 @test23(i8* %P, i64 %A){
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%B = getelementptr inbounds i8* %P, i64 %A
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%C = ptrtoint i8* %B to i64
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%D = trunc i64 %C to i32
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%E = ptrtoint i8* %P to i64
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%F = trunc i64 %E to i32
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%G = sub i32 %D, %F
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ret i32 %G
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; CHECK-LABEL: @test23(
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; CHECK-NEXT: = trunc i64 %A to i32
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; CHECK-NEXT: ret i32
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}
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define i8 @test23_as1(i8 addrspace(1)* %P, i16 %A) {
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; CHECK: @test23_as1
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; CHECK-NEXT: = trunc i16 %A to i8
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; CHECK-NEXT: ret i8
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%B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A
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%C = ptrtoint i8 addrspace(1)* %B to i16
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%D = trunc i16 %C to i8
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%E = ptrtoint i8 addrspace(1)* %P to i16
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%F = trunc i16 %E to i8
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%G = sub i8 %D, %F
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ret i8 %G
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}
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define i64 @test24(i8* %P, i64 %A){
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%B = getelementptr inbounds i8* %P, i64 %A
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%C = ptrtoint i8* %B to i64
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%E = ptrtoint i8* %P to i64
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%G = sub i64 %C, %E
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ret i64 %G
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; CHECK-LABEL: @test24(
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; CHECK-NEXT: ret i64 %A
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}
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define i16 @test24_as1(i8 addrspace(1)* %P, i16 %A) {
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; CHECK: @test24_as1
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; CHECK-NEXT: ret i16 %A
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%B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A
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%C = ptrtoint i8 addrspace(1)* %B to i16
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%E = ptrtoint i8 addrspace(1)* %P to i16
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%G = sub i16 %C, %E
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ret i16 %G
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}
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define i64 @test24a(i8* %P, i64 %A){
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%B = getelementptr inbounds i8* %P, i64 %A
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%C = ptrtoint i8* %B to i64
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%E = ptrtoint i8* %P to i64
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%G = sub i64 %E, %C
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ret i64 %G
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; CHECK-LABEL: @test24a(
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; CHECK-NEXT: sub i64 0, %A
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; CHECK-NEXT: ret i64
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}
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define i16 @test24a_as1(i8 addrspace(1)* %P, i16 %A) {
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; CHECK: @test24a_as1
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; CHECK-NEXT: sub i16 0, %A
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; CHECK-NEXT: ret i16
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%B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A
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%C = ptrtoint i8 addrspace(1)* %B to i16
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%E = ptrtoint i8 addrspace(1)* %P to i16
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%G = sub i16 %E, %C
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ret i16 %G
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}
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@Arr = external global [42 x i16]
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define i64 @test24b(i8* %P, i64 %A){
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%B = getelementptr inbounds [42 x i16]* @Arr, i64 0, i64 %A
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%C = ptrtoint i16* %B to i64
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%G = sub i64 %C, ptrtoint ([42 x i16]* @Arr to i64)
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ret i64 %G
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; CHECK-LABEL: @test24b(
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; CHECK-NEXT: shl nuw i64 %A, 1
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; CHECK-NEXT: ret i64
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}
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define i64 @test25(i8* %P, i64 %A){
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%B = getelementptr inbounds [42 x i16]* @Arr, i64 0, i64 %A
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%C = ptrtoint i16* %B to i64
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%G = sub i64 %C, ptrtoint (i16* getelementptr ([42 x i16]* @Arr, i64 1, i64 0) to i64)
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ret i64 %G
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; CHECK-LABEL: @test25(
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; CHECK-NEXT: shl nuw i64 %A, 1
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; CHECK-NEXT: add i64 {{.*}}, -84
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; CHECK-NEXT: ret i64
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}
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@Arr_as1 = external addrspace(1) global [42 x i16]
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define i16 @test25_as1(i8 addrspace(1)* %P, i64 %A) {
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; CHECK: @test25_as1
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; CHECK-NEXT: %1 = trunc i64 %A to i16
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; CHECK-NEXT: shl nuw i16 %1, 1
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; CHECK-NEXT: add i16 {{.*}}, -84
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; CHECK-NEXT: ret i16
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%B = getelementptr inbounds [42 x i16] addrspace(1)* @Arr_as1, i64 0, i64 %A
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%C = ptrtoint i16 addrspace(1)* %B to i16
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%G = sub i16 %C, ptrtoint (i16 addrspace(1)* getelementptr ([42 x i16] addrspace(1)* @Arr_as1, i64 1, i64 0) to i16)
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ret i16 %G
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}
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define i32 @test26(i32 %x) {
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%shl = shl i32 3, %x
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%neg = sub i32 0, %shl
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ret i32 %neg
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; CHECK-LABEL: @test26(
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; CHECK-NEXT: shl i32 -3
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; CHECK-NEXT: ret i32
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}
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define i32 @test27(i32 %x, i32 %y) {
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%mul = mul i32 %y, -8
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%sub = sub i32 %x, %mul
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ret i32 %sub
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; CHECK-LABEL: @test27(
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; CHECK-NEXT: shl i32 %y, 3
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; CHECK-NEXT: add i32
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; CHECK-NEXT: ret i32
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}
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define i32 @test28(i32 %x, i32 %y, i32 %z) {
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%neg = sub i32 0, %z
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%mul = mul i32 %neg, %y
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%sub = sub i32 %x, %mul
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ret i32 %sub
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; CHECK-LABEL: @test28(
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; CHECK-NEXT: mul i32 %z, %y
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; CHECK-NEXT: add i32
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; CHECK-NEXT: ret i32
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}
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define i64 @test29(i8* %foo, i64 %i, i64 %j) {
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%gep1 = getelementptr inbounds i8* %foo, i64 %i
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%gep2 = getelementptr inbounds i8* %foo, i64 %j
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%cast1 = ptrtoint i8* %gep1 to i64
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%cast2 = ptrtoint i8* %gep2 to i64
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%sub = sub i64 %cast1, %cast2
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ret i64 %sub
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; CHECK-LABEL: @test29(
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; CHECK-NEXT: sub i64 %i, %j
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; CHECK-NEXT: ret i64
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}
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define i64 @test30(i8* %foo, i64 %i, i64 %j) {
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%bit = bitcast i8* %foo to i32*
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%gep1 = getelementptr inbounds i32* %bit, i64 %i
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%gep2 = getelementptr inbounds i8* %foo, i64 %j
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%cast1 = ptrtoint i32* %gep1 to i64
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%cast2 = ptrtoint i8* %gep2 to i64
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%sub = sub i64 %cast1, %cast2
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ret i64 %sub
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; CHECK-LABEL: @test30(
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; CHECK-NEXT: %gep1.idx = shl nuw i64 %i, 2
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; CHECK-NEXT: sub i64 %gep1.idx, %j
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; CHECK-NEXT: ret i64
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}
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define i16 @test30_as1(i8 addrspace(1)* %foo, i16 %i, i16 %j) {
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; CHECK-LABEL: @test30_as1(
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; CHECK-NEXT: %gep1.idx = shl nuw i16 %i, 2
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; CHECK-NEXT: sub i16 %gep1.idx, %j
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; CHECK-NEXT: ret i16
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%bit = bitcast i8 addrspace(1)* %foo to i32 addrspace(1)*
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%gep1 = getelementptr inbounds i32 addrspace(1)* %bit, i16 %i
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%gep2 = getelementptr inbounds i8 addrspace(1)* %foo, i16 %j
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%cast1 = ptrtoint i32 addrspace(1)* %gep1 to i16
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%cast2 = ptrtoint i8 addrspace(1)* %gep2 to i16
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%sub = sub i16 %cast1, %cast2
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ret i16 %sub
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}
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define <2 x i64> @test31(<2 x i64> %A) {
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%xor = xor <2 x i64> %A, <i64 -1, i64 -1>
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%sub = sub <2 x i64> <i64 2, i64 3>, %xor
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ret <2 x i64> %sub
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; CHECK-LABEL: @test31(
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; CHECK-NEXT: %sub = add <2 x i64> %A, <i64 3, i64 4>
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; CHECK-NEXT: ret <2 x i64> %sub
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}
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define <2 x i64> @test32(<2 x i64> %A) {
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%add = add <2 x i64> %A, <i64 -1, i64 -1>
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%sub = sub <2 x i64> <i64 2, i64 3>, %add
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ret <2 x i64> %sub
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; CHECK-LABEL: @test32(
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; CHECK-NEXT: %sub = sub <2 x i64> <i64 3, i64 4>
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; CHECK-NEXT: ret <2 x i64> %sub
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}
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define <2 x i64> @test33(<2 x i1> %A) {
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%ext = zext <2 x i1> %A to <2 x i64>
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%sub = sub <2 x i64> zeroinitializer, %ext
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ret <2 x i64> %sub
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; CHECK-LABEL: @test33(
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; CHECK-NEXT: %sub = sext <2 x i1> %A to <2 x i64>
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; CHECK-NEXT: ret <2 x i64> %sub
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}
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define <2 x i64> @test34(<2 x i1> %A) {
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%ext = sext <2 x i1> %A to <2 x i64>
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%sub = sub <2 x i64> zeroinitializer, %ext
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ret <2 x i64> %sub
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; CHECK-LABEL: @test34(
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; CHECK-NEXT: %sub = zext <2 x i1> %A to <2 x i64>
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; CHECK-NEXT: ret <2 x i64> %sub
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}
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define <2 x i64> @test35(<2 x i64> %A) {
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%mul = mul <2 x i64> %A, <i64 3, i64 4>
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%sub = sub <2 x i64> %A, %mul
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ret <2 x i64> %sub
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; CHECK-LABEL: @test35(
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; CHECK-NEXT: %sub = mul <2 x i64> %A, <i64 -2, i64 -3>
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; CHECK-NEXT: ret <2 x i64> %sub
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}
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define <2 x i64> @test36(<2 x i64> %A) {
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%shl = shl <2 x i64> %A, <i64 3, i64 4>
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%sub = sub <2 x i64> %shl, %A
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ret <2 x i64> %sub
|
|
; CHECK-LABEL: @test36(
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; CHECK-NEXT: %sub = mul <2 x i64> %A, <i64 7, i64 15>
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; CHECK-NEXT: ret <2 x i64> %sub
|
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}
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|
|
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define <2 x i32> @test37(<2 x i32> %A) {
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|
%div = sdiv <2 x i32> %A, <i32 -2147483648, i32 -2147483648>
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|
%sub = sub nsw <2 x i32> zeroinitializer, %div
|
|
ret <2 x i32> %sub
|
|
; CHECK-LABEL: @test37(
|
|
; CHECK-NEXT: [[ICMP:%.*]] = icmp eq <2 x i32> %A, <i32 -2147483648, i32 -2147483648>
|
|
; CHECK-NEXT: [[SEXT:%.*]] = sext <2 x i1> [[ICMP]] to <2 x i32>
|
|
; CHECK-NEXT: ret <2 x i32> [[SEXT]]
|
|
}
|
|
|
|
define i32 @test38(i32 %A) {
|
|
%div = sdiv i32 %A, -2147483648
|
|
%sub = sub nsw i32 0, %div
|
|
ret i32 %sub
|
|
; CHECK-LABEL: @test38(
|
|
; CHECK-NEXT: [[ICMP:%.*]] = icmp eq i32 %A, -2147483648
|
|
; CHECK-NEXT: [[SEXT:%.*]] = sext i1 [[ICMP]] to i32
|
|
; CHECK-NEXT: ret i32 [[SEXT]]
|
|
}
|
|
|
|
define i32 @test39(i32 %A, i32 %x) {
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|
%B = sub i32 0, %A
|
|
%C = sub nsw i32 %x, %B
|
|
ret i32 %C
|
|
; CHECK-LABEL: @test39(
|
|
; CHECK: %C = add i32 %x, %A
|
|
; CHECK: ret i32 %C
|
|
}
|