a1710eb3cd
The LIT test cases were migrated with the script provided by Nikita Popov. No manual changes were made. Committed without review since no functional changes, after consultation with uweigand.
83 lines
2.1 KiB
LLVM
83 lines
2.1 KiB
LLVM
; Test the three-operand form of 32-bit subtraction.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
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declare i32 @foo(i32, i32, i32)
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; Check SLRK.
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define i32 @f1(i32 %dummy, i32 %a, i32 %b, ptr %flag) {
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; CHECK-LABEL: f1:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: afi [[REG]], -536870912
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; CHECK: srl [[REG]], 31
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; CHECK: st [[REG]], 0(%r5)
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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%ext = zext i1 %obit to i32
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store i32 %ext, ptr %flag
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ret i32 %val
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}
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; Check using the overflow result for a branch.
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define i32 @f2(i32 %dummy, i32 %a, i32 %b) {
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; CHECK-LABEL: f2:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK-NEXT: bnler %r14
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; CHECK: lhi %r2, 0
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; CHECK: jg foo@PLT
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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br i1 %obit, label %call, label %exit
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call:
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%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
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ret i32 %res
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exit:
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ret i32 %val
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}
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; ... and the same with the inverted direction.
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define i32 @f3(i32 %dummy, i32 %a, i32 %b) {
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; CHECK-LABEL: f3:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK-NEXT: bler %r14
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; CHECK: lhi %r2, 0
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; CHECK: jg foo@PLT
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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br i1 %obit, label %exit, label %call
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call:
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%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
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ret i32 %res
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exit:
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ret i32 %val
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}
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; Check that we can still use SLR in obvious cases.
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define i32 @f4(i32 %a, i32 %b, ptr %flag) {
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; CHECK-LABEL: f4:
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; CHECK: slr %r2, %r3
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: afi [[REG]], -536870912
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; CHECK: srl [[REG]], 31
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; CHECK: st [[REG]], 0(%r4)
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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%ext = zext i1 %obit to i32
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store i32 %ext, ptr %flag
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ret i32 %val
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}
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declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) nounwind readnone
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