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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34000 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -145,3 +145,12 @@ ldr r2, [r2, #7 * 4]
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This is especially bad when dynamic alloca is used. The all fixed size stack
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objects are referenced off the frame pointer with negative offsets. See
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oggenc for an example.
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//===---------------------------------------------------------------------===//
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We are reserving R3 as a scratch register under thumb mode. So if it is live in
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to the function, we save / restore R3 to / from R12. Until register scavenging
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is done, we should save R3 to a high callee saved reg at emitPrologue time
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(when hasFP is true or stack size is large) and restore R3 from that register
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instead. This allows us to at least get rid of the save to r12 everytime it is
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used.
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