71 lines
2.1 KiB
LLVM
71 lines
2.1 KiB
LLVM
; Test that multiple select statements using the same condition are expanded
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; into a single conditional branch when possible.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -disable-block-placement | FileCheck %s
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define void @test0(i32 signext %positive, double %base, double %offset, double* %rmin, double* %rmax) {
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entry:
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; CHECK-LABEL: test0
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; CHECK: cijlh %r2, 0,
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; CHECK-NOT: cij
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; CHECK-NOT: je
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; CHECK-NOT: jlh
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%tobool = icmp eq i32 %positive, 0
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%add = fadd double %base, %offset
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%min = select i1 %tobool, double %add, double %base
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%max = select i1 %tobool, double %base, double %add
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store double %min, double* %rmin, align 8
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store double %max, double* %rmax, align 8
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ret void
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}
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; Two selects with an intervening instruction that doesn't clobber CC can
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; still be merged.
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define double @test1(i32 signext %positive, double %A, double %B, double %C) {
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entry:
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; CHECK-LABEL: test1
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; CHECK: cijhe {{.*}}LBB1_2
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; CHECK-NOT: cij
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; CHECK: br %r14
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%tobool = icmp slt i32 %positive, 0
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%s1 = select i1 %tobool, double %A, double %B
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%mul = fmul double %A, %B
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%s2 = select i1 %tobool, double %B, double %C
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%add = fadd double %s1, %s2
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%add2 = fadd double %add, %mul
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ret double %add2
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}
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; Two selects with an intervening user of the first select can't be merged.
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define double @test2(i32 signext %positive, double %A, double %B) {
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entry:
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; CHECK-LABEL: test2
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; CHECK: cije {{.*}}LBB2_2
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; CHECK: cibe {{.*}}%r14
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; CHECK: br %r14
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%tobool = icmp eq i32 %positive, 0
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%s1 = select i1 %tobool, double %A, double %B
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%add = fadd double %A, %s1
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%s2 = select i1 %tobool, double %A, double %add
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ret double %s2
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}
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; Two selects with different conditions can't be merged
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define double @test3(i32 signext %positive, double %A, double %B, double %C) {
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entry:
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; CHECK-LABEL: test3
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; CHECK: cijl {{.*}}LBB3_2
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; CHECK: cijl {{.*}}LBB3_4
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; CHECK: br %r14
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%tobool = icmp slt i32 %positive, 0
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%s1 = select i1 %tobool, double %A, double %B
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%tobool2 = icmp slt i32 %positive, 2
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%s2 = select i1 %tobool2, double %B, double %C
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%add = fadd double %s1, %s2
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ret double %add
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}
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