Subzero: Align spill locations to natural alignment.
This requires sorting the spilled variables based on alignment and
introducing additional padding around the spill location areas.
These changes allow vector instructions to accept memory operands.
Old stack frame layout: New stack frame layout:
+---------------------+ +---------------------+
| return address | | return address |
+---------------------+ +---------------------+
| preserved registers | | preserved registers |
+---------------------+ +---------------------+
| global spill area | | padding |
+---------------------+ +---------------------+
| local spill area | | global spill area |
+---------------------+ +---------------------+
| padding | | padding |
+---------------------+ +---------------------+
| local variables | | local spill area |
+---------------------+ +---------------------+
| padding |
+---------------------+
| local variables |
+---------------------+
BUG=none
R=jvoung@chromium.org, stichnot@chromium.org
Review URL: https://codereview.chromium.org/465413003
diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index 91512a9..39e08de 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -134,7 +134,7 @@
virtual bool hasFramePointer() const { return false; }
virtual SizeT getFrameOrStackReg() const = 0;
- virtual size_t typeWidthInBytesOnStack(Type Ty) = 0;
+ virtual size_t typeWidthInBytesOnStack(Type Ty) const = 0;
bool hasComputedFrame() const { return HasComputedFrame; }
int32_t getStackAdjustment() const { return StackAdjustment; }
void updateStackAdjustment(int32_t Offset) { StackAdjustment += Offset; }