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52ed61204b
which branch on undef to branch on a boolean constant for the edge exiting the loop. This helps ScalarEvolution compute trip counts for loops. Teach ScalarEvolution to recognize single-value PHIs, when safe, and ForgetSymbolicName to forget such single-value PHI nodes as apprpriate in ForgetSymbolicName. llvm-svn: 97126
48 lines
2.1 KiB
LLVM
48 lines
2.1 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-freebsd7.2 -code-model=kernel | FileCheck %s
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; PR4689
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%struct.__s = type { [8 x i8] }
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%struct.pcb = type { i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i16, i8* }
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%struct.pcpu = type { i32*, i32*, i32*, i32*, %struct.pcb*, i64, i32, i32, i32, i32 }
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define i64 @hammer_time(i64 %modulep, i64 %physfree) nounwind ssp noredzone noimplicitfloat {
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; CHECK: hammer_time:
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; CHECK: movq $Xrsvd, %rax
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; CHECK: movq $Xrsvd, %rcx
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entry:
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br i1 undef, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %if.end
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if.end: ; preds = %if.then, %entry
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br label %for.body
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for.body: ; preds = %for.inc, %if.end
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switch i32 undef, label %if.then76 [
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i32 9, label %for.inc
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i32 10, label %for.inc
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i32 11, label %for.inc
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i32 12, label %for.inc
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]
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if.then76: ; preds = %for.body
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unreachable
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for.inc: ; preds = %for.body, %for.body, %for.body, %for.body
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br i1 undef, label %for.end, label %for.body
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for.end: ; preds = %for.inc
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call void asm sideeffect "mov $1,%gs:$0", "=*m,r,~{dirflag},~{fpsr},~{flags}"(%struct.__s* bitcast (%struct.pcb** getelementptr (%struct.pcpu* null, i32 0, i32 4) to %struct.__s*), i64 undef) nounwind
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br label %for.body170
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for.body170: ; preds = %for.body170, %for.end
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store i64 or (i64 and (i64 or (i64 ptrtoint (void (i32, i32, i32, i32)* @Xrsvd to i64), i64 2097152), i64 2162687), i64 or (i64 or (i64 and (i64 shl (i64 ptrtoint (void (i32, i32, i32, i32)* @Xrsvd to i64), i64 32), i64 -281474976710656), i64 140737488355328), i64 15393162788864)), i64* undef
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br i1 undef, label %for.end175, label %for.body170
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for.end175: ; preds = %for.body170
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unreachable
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}
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declare void @Xrsvd(i32, i32, i32, i32) ssp noredzone noimplicitfloat
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