ppc-disable-non-volatile-cr.ll
1.84 KB
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; Note: Test option to disable use of non-volatile CR to avoid CR spilling in prologue.
; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -ppc-disable-non-volatile-cr\
; RUN: -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr < %s | FileCheck --check-prefix=CHECK-DISABLE %s
; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu\
; RUN: -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr < %s | FileCheck --check-prefix=CHECK-ENABLE %s
; Function Attrs: nounwind
define dso_local signext i32 @DisableNonVolatileCR(i32 signext %a, i32 signext %b) {
; CHECK-DISABLE-LABEL: DisableNonVolatileCR:
; CHECK-DISABLE: # %bb.0: # %entry
; CHECK-DISABLE-NOT: mfocrf [[REG1:r[0-9]+]]
; CHECK-DISABLE-NOT: stw [[REG1]]
; CHECK-DISABLE: stdu r1
; CHECK-DISABLE-DAG: mfocrf [[REG2:r[0-9]+]]
; CHECK-DISABLE-DAG: stw [[REG2]]
; CHECK-DISABLE: # %bb.1: # %if.then
;
; CHECK-ENABLE-LABEL: DisableNonVolatileCR:
; CHECK-ENABLE: # %bb.0: # %entry
; CHECK-ENABLE-DAG: mfocrf [[REG1:r[0-9]+]]
; CHECK-ENABLE-DAG: stw [[REG1]]
; CHECK-ENABLE: stdu r1
; CHECK-ENABLE-NOT: mfocrf [[REG2:r[0-9]+]]
; CHECK-ENABLE-NOT: stw [[REG2]]
; CHECK-ENABLE: # %bb.1: # %if.then
entry:
%cmp = icmp slt i32 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
tail call void bitcast (void (...)* @fa to void ()*)()
br label %if.end
if.else: ; preds = %entry
tail call void bitcast (void (...)* @fb to void ()*)()
br label %if.end
if.end: ; preds = %if.else, %if.then
%conv = zext i1 %cmp to i32
%call = tail call signext i32 @callee(i32 signext %conv)
ret i32 %call
}
declare void @fa(...)
declare void @fb(...)
declare signext i32 @callee(i32 signext)