[llvm-commits] [llvm] r143086 - in /llvm/trunk: lib/Target/ARM/ARMFastISel.cpp test/CodeGen/ARM/fast-isel-br-const.ll
Chad Rosier
mcrosier at apple.com
Wed Oct 26 17:21:16 PDT 2011
Author: mcrosier
Date: Wed Oct 26 19:21:16 2011
New Revision: 143086
URL: http://llvm.org/viewvc/llvm-project?rev=143086&view=rev
Log:
A branch predicated on a constant can just FastEmit an unconditional branch.
Added:
llvm/trunk/test/CodeGen/ARM/fast-isel-br-const.ll
Modified:
llvm/trunk/lib/Target/ARM/ARMFastISel.cpp
Modified: llvm/trunk/lib/Target/ARM/ARMFastISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMFastISel.cpp?rev=143086&r1=143085&r2=143086&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMFastISel.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMFastISel.cpp Wed Oct 26 19:21:16 2011
@@ -1151,6 +1151,12 @@
FuncInfo.MBB->addSuccessor(TBB);
return true;
}
+ } else if (const ConstantInt *CI =
+ dyn_cast<ConstantInt>(BI->getCondition())) {
+ uint64_t Imm = CI->getZExtValue();
+ MachineBasicBlock *Target = (Imm == 0) ? FBB : TBB;
+ FastEmitBranch(Target, DL);
+ return true;
}
unsigned CmpReg = getRegForValue(BI->getCondition());
Added: llvm/trunk/test/CodeGen/ARM/fast-isel-br-const.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/fast-isel-br-const.ll?rev=143086&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/ARM/fast-isel-br-const.ll (added)
+++ llvm/trunk/test/CodeGen/ARM/fast-isel-br-const.ll Wed Oct 26 19:21:16 2011
@@ -0,0 +1,47 @@
+; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-darwin | FileCheck %s --check-prefix=ARM
+; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-darwin | FileCheck %s --check-prefix=THUMB
+
+define i32 @t1(i32 %a, i32 %b) nounwind uwtable ssp {
+entry:
+; THUMB: t1:
+; ARM: t1:
+
+ br i1 1, label %if.then, label %if.else
+; THUMB-NOT: b LBB0_1
+; ARM-NOT: b LBB0_1
+
+if.then: ; preds = %entry
+ call void @foo1()
+ br label %if.end7
+
+if.else: ; preds = %entry
+ br i1 0, label %if.then2, label %if.else3
+; THUMB: b LBB0_4
+; ARM: b LBB0_4
+
+if.then2: ; preds = %if.else
+ call void @foo2()
+ br label %if.end6
+
+if.else3: ; preds = %if.else
+ br i1 1, label %if.then5, label %if.end
+; THUMB-NOT: b LBB0_5
+; ARM-NOT: b LBB0_5
+
+if.then5: ; preds = %if.else3
+ call void @foo1()
+ br label %if.end
+
+if.end: ; preds = %if.then5, %if.else3
+ br label %if.end6
+
+if.end6: ; preds = %if.end, %if.then2
+ br label %if.end7
+
+if.end7: ; preds = %if.end6, %if.then
+ ret i32 0
+}
+
+declare void @foo1()
+
+declare void @foo2()
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