164 lines
2.7 KiB
LLVM
164 lines
2.7 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 | FileCheck %s
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;
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; Check that signed comparisons against 0 are only eliminated if the "nsw"
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; flag is present on the defining add (with register) instruction. For an
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; equality comparison, add logical can be used.
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define i32 @fun0(i32 %arg, i32 %arg2, i32 %arg3) {
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; CHECK-LABEL: fun0:
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; CHECK: jle .LBB0_2{{$}}
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; CHECK: je .LBB0_4{{$}}
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bb:
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%tmp2 = add nsw i32 %arg, %arg2
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%tmp3 = icmp sgt i32 %tmp2, 0
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br i1 %tmp3, label %bb3, label %bb1
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bb1:
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%tmp4 = add nsw i32 %arg, %arg3
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%tmp5 = icmp eq i32 %tmp4, 0
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br i1 %tmp5, label %bb4, label %bb2
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bb2:
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ret i32 0
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bb3:
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ret i32 1
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bb4:
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ret i32 2
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}
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; No "nsw" flag
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define i32 @fun1(i32 %arg, i32 %arg2, i32 %arg3) {
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; CHECK-LABEL: fun1:
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; CHECK: cijle
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; CHECK: alr
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; CHECK: jhe
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bb:
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%tmp2 = add i32 %arg, %arg2
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%tmp3 = icmp sgt i32 %tmp2, 0
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br i1 %tmp3, label %bb3, label %bb1
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bb1:
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%tmp4 = add i32 %arg, %arg3
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%tmp5 = icmp eq i32 %tmp4, 0
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br i1 %tmp5, label %bb4, label %bb2
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bb2:
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ret i32 0
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bb3:
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ret i32 1
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bb4:
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ret i32 2
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}
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; "nuw" flag
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define i32 @fun2(i32 %arg, i32 %arg2, i32 %arg3) {
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; CHECK-LABEL: fun2:
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; CHECK: cijle
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; CHECK: alr
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; CHECK: jhe
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bb:
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%tmp2 = add nuw i32 %arg, %arg2
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%tmp3 = icmp sgt i32 %tmp2, 0
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br i1 %tmp3, label %bb3, label %bb1
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bb1:
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%tmp4 = add nuw i32 %arg, %arg3
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%tmp5 = icmp eq i32 %tmp4, 0
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br i1 %tmp5, label %bb4, label %bb2
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bb2:
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ret i32 0
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bb3:
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ret i32 1
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bb4:
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ret i32 2
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}
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; Subtraction does not produce the value of zero in case of overflow, so
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; "nsw" is not needed for the equality check against zero.
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define i32 @fun3(i32 %arg, i32 %arg2, i32 %arg3) {
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; CHECK-LABEL: fun3:
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; CHECK: jle .LBB3_2{{$}}
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; CHECK: je .LBB3_4{{$}}
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bb:
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%tmp2 = sub nsw i32 %arg, %arg2
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%tmp3 = icmp sgt i32 %tmp2, 0
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br i1 %tmp3, label %bb3, label %bb1
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bb1:
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%tmp4 = sub nsw i32 %arg, %arg3
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%tmp5 = icmp eq i32 %tmp4, 0
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br i1 %tmp5, label %bb4, label %bb2
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bb2:
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ret i32 0
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bb3:
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ret i32 1
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bb4:
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ret i32 2
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}
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; No "nsw" flag
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define i32 @fun4(i32 %arg, i32 %arg2, i32 %arg3) {
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; CHECK-LABEL: fun4:
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; CHECK: cijle
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; CHECK: je .LBB4_4{{$}}
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bb:
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%tmp2 = sub i32 %arg, %arg2
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%tmp3 = icmp sgt i32 %tmp2, 0
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br i1 %tmp3, label %bb3, label %bb1
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bb1:
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%tmp4 = sub i32 %arg, %arg3
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%tmp5 = icmp eq i32 %tmp4, 0
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br i1 %tmp5, label %bb4, label %bb2
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bb2:
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ret i32 0
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bb3:
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ret i32 1
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bb4:
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ret i32 2
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}
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; "nuw" flag
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define i32 @fun5(i32 %arg, i32 %arg2, i32 %arg3) {
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; CHECK-LABEL: fun5:
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; CHECK: cijle
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; CHECK: je .LBB5_4{{$}}
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bb:
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%tmp2 = sub nuw i32 %arg, %arg2
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%tmp3 = icmp sgt i32 %tmp2, 0
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br i1 %tmp3, label %bb3, label %bb1
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bb1:
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%tmp4 = sub nuw i32 %arg, %arg3
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%tmp5 = icmp eq i32 %tmp4, 0
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br i1 %tmp5, label %bb4, label %bb2
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bb2:
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ret i32 0
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bb3:
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ret i32 1
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bb4:
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ret i32 2
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}
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