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# Support macros for the assembly test cases.

        .macro start
        .text
        .global start
start:
        .endm

        # Perform a single to double precision floating point conversion.
        .macro _s2d fpr dpr
        flds \fpr, fpul
        _setpr
        fcnvsd fpul, \dpr
        _clrpr
        .endm

        # Set the PR (PRecision) bit in the FPSCR.
        .macro _setpr
        sts fpscr, r7
        mov #8, r8
        shll16 r8
        or r8, r7
        lds r7, fpscr
        .endm

        # Clear the PR bit.
        .macro _clrpr
        sts fpscr, r7
        mov #8, r8
        shll16 r8
        not r8, r8
        and r8, r7
        lds r7, fpscr
        .endm

        # nb: this macro clobbers R7. 
        .macro assert reg value
        mov \value, r7
        cmp/eq \reg, r7
        bf wrong
        .endm

        .macro pass
        trapa #253
        .endm

        .macro fail
        trapa #254
        .endm